People are answering this question in ENTIRELY the wrong way.. It is not about how insecure the OP is.. the OP wants to know if his tattoo will look good on a small canvas, and nobody answered the question.
I actually have the same question.. I have a disabled arm with 0 fat and 0 muscle that I intend to get sleeved, and I would like to know if designs will get overly wrapped, and know that small surface areas can result in great tattoos as much as larger areas.
But, in response to OP: I have a half-sleeve(ish) on my other arm and I'm a very skinny guy... it looks fine. my dragon looks fully sized, so does the wolf.. though, my bicep is a lot bigger than a wrist is. But, discuss it with your artist. If you don't like the sketch, don't get it.